Augmented chords

An augmented chord is a 3-note chord — the root plus a major third and an augmented fifth above it. The fifth is raised a semitone, so the chord is two major thirds stacked on top of each other.

It sounds eerie and weightless, rarely content to sit still. Below are the augmented chords for all twelve keys, from C to B — pick any chart for its full set of voicings, the piano shape and how it's built.